Big bang nucleosynthesis occurred within the first three minutes of the beginning of the universe and is responsible for much of the abundance of 1 h , 2 h (d, deuterium), 3 he , and 4 he. Now, the universe creates the elements that will create life, and everything we know in epochs of the universe – mission 05: era of nucleosynthesis.
In astronomy – and astrophysics and cosmology – there are two main kinds of nucleosynthesis, big bang nucleosynthesis (bbn), and stellar nucleosynthesis in the amazingly successful set of theories which are popularly called the big bang theory, the early universe was very dense, and very hot.
Explanation of element formation through big bang nucleosynthesis, stellar nucleosynthesis, and supernovae nucleosynthesis the elements that are formed in each type of nucleosynthesis and the. Big bang nucleosynthesis the universe's light-element abundance is another important criterion by which the big bang hypothesis is verified it is now known that the elements observed in the universe were created in either of two ways.
Big bang nucleosynthesis predicts a primordial abundance of about 25% helium-4 by mass, irrespective of the initial conditions of the universe as long as the universe was hot enough for protons and neutrons to transform into each other easily, their ratio, determined solely by their relative masses, was about 1 neutron to 7 protons (allowing for some decay of neutrons into protons. Epochs of the universe – mission 05: era of nucleosynthesis you are embarking on a journey through space and time itself back through time, you traverse the eras of the universe, closer and closer to the beginning of everything. The first nucleosynthesis in the universe took place in the period from 10 to 1000 s after the big bang the temperature ( kt ) of the universe ranged from about 100 to 10 kev until 10 s from the big bang, the temperature was too high to synthesize nuclei.
Below is a graphical summation of nucleosynthesis in the early universe the graph shows the relative abundances of different nuclei (vertical axis) during the first three hours of creation the horizontal axis has been labeled using both time (top) and the equivalent temperature (bottom. The second nucleosynthesis in the universe took place in the evolution of primordial stars formed after about 1×10 8 y from the big bang the first stage of evolution is the h burning, where 4 he is produced from four 1 h nuclei.
Nucleosynthesis in the early universe the term nucleosynthesis refers to the formation of heavier elements, atomic nuclei with many protons and neutrons, from the fusion of lighter elements the big bang theory predicts that the early universe was a very hot place. Why is the nucleosynthesis era so important in determining the chemical composition of the universe except for a small amount of elements heavier than helium produced later by stars, the chemical composition of the universe is the same now as at the end of the nucleosynthesis era.
The overall structure of the universe is very uniform, but the universe must have contained some regions of higher density in order for galaxies to form helium originates from mostly from the big bang with a small contribution from stellar nucleosynthesis. This first process may be called nucleogenesis, the genesis of nucleons in the universe the subsequent nucleosynthesis of the elements (including all carbon, all oxygen, etc) occurs primarily in.